While doing some minor tests with constraints, I noticed that if some
method parameter is declared @Optional, and the parameter is null, any
additional constraints that parameter might have, are not invoked.
Example:
void doSomething(@Optional @MyCustomConstraint parameter);
If then parameter is null, the isValid method of the implementation of
@MyCustomConstraint is never invoked. Is this because if parameter is
null, no further constraint checking is deemed to be needed? Just
wondering. :)
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